Questions

Oxygen released during photosynthesis comes from splitting of water.

Photosynthesis is the process that converts solar energy into chemical energy. During the stage of light-dependent reactions involving photosystems I and II in photosynthesis, O2 produced.

China shares land borders with 14 different countries, the longest being with Mongolia followed by Russia and then India.

When water is cooled from 4°C to 0°C, its density decreases.

When water cools from 4°C to 0°C, ice crystals begin to form because the water is approaching its freezing point. When water freezes, the water molecules form a lattice that increases the volume. As a result, the density decreases. This is why ice will float on top of water; ice has a lower density than the water.

The main source of organic matter in soil is the plant and animal tissue that decompose at each level of breakdown.